ISO 1181:2004

Overview

ISO 1181:2004 specifies requirements for natural fibre ropes made from manila (abaca) and sisal, covering three construction types: 3‑strand hawser‑laid, 4‑strand shroud‑laid and 8‑strand braided ropes. The standard defines construction types, designation rules, physical property limits (linear density and minimum breaking force), lubrication/finish limits, and marking/packaging rules for general‑service manila and sisal ropes.

Key topics and technical requirements

• Scope and designation
  • Rules for identifying ropes (example: “Fibre rope ISO 1181 - A - 52 - MA” indicating type, reference number and material).
• Approved constructions
  • Type A: 3‑strand hawser‑laid
  • Type B: 4‑strand shroud‑laid
  • Type L: 8‑strand braided
• Physical properties
  • Tabulated linear density (ktex) and minimum breaking force (kN) for each reference number/approximate diameter for manila and sisal ropes.
  • Notes on testing conditions (new, dry and wet ropes) and reductions for eye‑spliced terminations.
• Lubrication and finish
  • Limits on dressing (maximum 15% of dry mass when measured per ISO 2307).
  • Requirements for water‑repellent treatments (types allowed, not to reduce yarn/rope strength) and specified mass increase limits after immersion tests.
  • Restrictions on colouring-only protective agents permitted.
• Manufacture, labelling and delivery
  • Construction, lay, packaging, invoicing and delivery lengths referenced to ISO 9554.
  • Marking requirements aligned with ISO 9554.

Applications and who uses ISO 1181:2004

• Rope manufacturers producing manila or sisal cordage for general service use the standard to ensure consistent construction and performance.
• Quality control and testing laboratories apply the physical property and dressing test limits (referencing ISO 2307) to verify compliance.
• Marine, agricultural and industrial users specifying natural‑fibre ropes for mooring, towing, rigging, handling or general utility can reference ISO 1181 for procurement criteria.
• Procurement officers and suppliers rely on the designation and marking rules to clearly specify and receive the correct rope type, size and material.

Related standards

• ISO 2307 - Ropes: determination of certain physical and mechanical properties (test methods referenced).
• ISO 1968 - Fibre ropes: terms and definitions.
• ISO 9554 - Fibre ropes: general specification (manufacture, packaging, marking and delivery rules referenced).

ISO 1181:2004 is essential for anyone specifying, producing or testing manila rope, sisal rope, or evaluating 3‑strand, 4‑strand and 8‑strand natural‑fibre cordage in regulated or commercial contexts.